#!/usr/bin/env python3

import argparse
import os
import sys

VARIANTS = ["alpine", "amazon", "arch", "centos", "debian", "fedora",
            "freebsd", "netbsd", "openbsd", "rhel", "suse", "ubuntu",
            "unknown"]


if "avoid-pep8-E402-import-not-top-of-file":
    _tdir = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
    sys.path.insert(0, _tdir)
    from cloudinit import templater
    from cloudinit import util
    from cloudinit.atomic_helper import write_file


def main():
    parser = argparse.ArgumentParser()
    platform = util.system_info()
    parser.add_argument(
        "--variant", default=platform['variant'], action="store",
        help="define the variant.", choices=VARIANTS)
    parser.add_argument(
        "template", nargs="?", action="store",
        default='./config/cloud.cfg.tmpl',
        help="Path to the cloud.cfg template")
    parser.add_argument(
        "output", nargs="?", action="store", default="-",
        help="Output file.  Use '-' to write to stdout")

    args = parser.parse_args()

    with open(args.template, 'r') as fh:
        contents = fh.read()
    tpl_params = {'variant': args.variant}
    contents = (templater.render_string(contents, tpl_params)).rstrip() + "\n"
    util.load_yaml(contents)
    if args.output == "-":
        sys.stdout.write(contents)
    else:
        write_file(args.output, contents, omode="w")

if __name__ == '__main__':
    main()
